Fan



NWIYS W251;

' J. E. FOSTER FAN Filed Jan. 14, 1927 Patented Nov. 15, 1927.

Application filed January 14, 1927,

1,649,161 PATENT OFFICE.

JAMES E. FOSTER, OF CLARKSBURQ, ONTARIO, CANADA.

FAN.

The invention relates to improvements in fans as described 111 the present SPOCll'lCLltlOll and shown in the accompanying drawings which form part of the same.

l Vhilst ticularly to the invention appcrtains more parfans f? pneumatic stackers of grain separators, it might equallywell be employed for fans used for other purposes.

In a patent granted to me Number 1,149,-

904 for a blower fan 1915, l disclosed a centre suction fan,

dated August 10th, fan which I termed a nonwhich was provided with an inlet situated to one side of the impeller axis, the blades of which lmpeller radiated from a tapering hub; the inclined forwardly in order face of each blade to produce axial and radial suction.

In practice it has 1S possessed of power in been foundthat this fan very considerable lifting comparison wlth the small rat1o of driving force consumed.

Furthermore, 1n addition to its other uses of general utility, be particularly this fan has been found to adaptable for the handling of grain since it does not destroy or in any way inn re the same on account'of the blades never actually whilst it is passing through the fan; in handling straw and hay it has been grain again,

demonstrated in contacting or striking the actual practice that commodities of this nature will not tend to choke or clog the fan as has beenexperienced with fans of other deslgns.

However, by reason of the forward inclination of its blades, as shown in the aforesaid patent, a

tendency has manifested itself to concentrate the material being delivered, this belng consequent upon the fans failure to spread the material uniformly as it passes through the outlet duct.

The main object of there-fore,

tributi on the present invention, is to provide for the uniform disof whatsoever material this fan may be engaged in handling.

Referring to the drawings, Figure 1 is a side elevation of the fan depicting its inlet side.

Figure fan.

Figure Figure 2 is a vertical sectional view of the wheel removed from the casing.

Figure is a transverse sectional view of one 5f the blades taken on the line 5-5 of Figure 1. Figure 6 is a further sectional view of the Serial No. 161,090, and in Canada January 21, 1926.

blade taken on the line 6-6 of the same fi ure. a l

Figure 7 is a still further sectional view taken on the line 7-4? such figure.

Lilre numerals of reference indicate corresponding parts in each figure throughout the drawings. 1

In the drawings, indicates generally has an inlet side 2 in fan construction.

On one side of this segmental inlet 3 and slightly beyond this inlet is the outlet duct 4. l X,

The fan wheel comprises a shaft 5 carrying a tapering hub 6 in the form oflthe frustrumof a cone, the base of-lwhicli rests against a substantial disk 7L Radiating from the hub at a tangent there. from are a plurality 'of fan blades 8, these blades being forwardly inclined so as to form an acute angle withthe disl r 7, the forward inclination of the blades inducing axial suction in order to forcevthematerial as it is drawn through the inlet 3 against, or in the region of, the disk 7, thus exhibiting a decided tendency to crowd or concentrate? it thereabout as heretofore recounted; to overcome which the present invention provides for the. bending of the outer part of each blade backwardly so as to offset its forward inclination.

It is preferred to bend the blades backwardly from a diagonal line A, shown in Figure 4 of the drawings, so as to divide each blade into a pair of approximate triangles, the inner triangular portion retaining its forward inclination, while the outer triangular portion is the one which is bent backwardly.

In the drawings, the represents the inner triangular, or forwardly inclined, and 10 the outer, or backwardly inclined, piece. In the same figure the upper blade shows its outer portion 10 outlined by the characters a, b and 0, thus clearly defining the triangular formation in question. 11 indicates the forwardly turnedv flange of the blade.

Whereas it is preferable to bend the blades triangular-1y as recounted, it will be clearly evident that this is purely a matter of choice and that the invention is not confined in this regard as to shape.

Having now described the preferred form of the invention capable of carrying the reference numeral 9 impeller axis is the same into practical operation, it is understood that changes in shape and general assemblage of the parts may be resorted to without departing from the spirit and scope of the invention, and the right is accordingly reserved by the inventor of making such changes and modifications as may fairly come within the spirit of his invention and the claims hereinafter following.

IVhat I claim is:-

1. In a fan of the class described, a fan wheel having a substantial portion of each blade forwardly inclined at an angle to the axis of rotation and the remainder backwardly nclined with respect to said forward inclination substantially the full width of the outer portion of each blade.

2. In a fan of the class described. a fan wheel having the major portion of each blade forwardly inclined at an angle to the axis of rotation and the minor portion thereof bent oppositely in said forward inclination to offset said forward inclination of the blades.

' 3. In a fan of the class described, a fan wheel having the major portion of each blade forwardly inclined at an angle to the axis of rotation and the minor portion thereofbent oppositely in said forward inclination to offset said forward inclination of the blades, said oppositely bent portion of the blade being located at the outer end of the fan wheel.

4. In a fan of the class described, a fan wheel comprising a tapering hub, blades radiating therefrom, the said blades being substantially inclined forwardly at an angle to the axis of rotation and being oppositely bent in said for\ 'ard inclination at their outer ends.

5. In a fan of the class described, a fan wheel comprising a tapering hub, a disc at right angles thereto, blades tangentially radiating from said hub and attached at their rear edges to said disc, said blades forwardly inclining at an angle to the :lXis of rotation and having their outer ends bent; rearwardly at a slight angle to their forward iuclina tion.

(i. In a fan of the class described, a fan wheel etnnprising a tapering hub, a disc at. right angles thereto, blades tangentially ras diating from said hub and attached at their rear edges to said disc, said blades forwardl v inclining at an angle to the axis of rotation and having their outer ends bent rearwardly on an oblique line.

7. In a fan of the class described, a fan wheel comprising a tapering hub, a disc at right angles thereto, blades tangentially radiating from said hub and attached at their rear edges to said disc, said blades forwardly inclining at an angle to the axis of rotation and having their outer ends bent rear- Warldy at a' slight angle to their forward inclination, the frontal edges of said blades being forwardly curved.

Signed at Toronto, Canada, this twelfth (12th) day of January, 1927.

JAMES E. FOSTER. 

